diff --git a/src/detail/ca-request-state.hpp b/src/detail/ca-request-state.hpp
index 7fa9f23..27d19fa 100644
--- a/src/detail/ca-request-state.hpp
+++ b/src/detail/ca-request-state.hpp
@@ -45,6 +45,12 @@
 std::string
 statusToString(Status status);
 
+/**
+ * @brief Convert request status to string.
+ */
+Status
+statusFromBlock(const Block& block);
+
 namespace ca {
 
 /**